Largest context windows in 2026
The largest context windows in the index. The top 20 models are ranked by token capacity, then by average benchmark score.
What the data shows
The largest window in the index is 2,000,000 tokens, held by GPT-5.2 Pro. The median across all 600 models is 32,768 tokens, so the leaders are far above the typical model.
A large window is not the same as effective long-context use. Retrieval quality, position bias and cost per token all affect whether the window is useful in practice.
How to read the ranking
- Check the output limit as well as the input window.
- Long prompts cost more; estimate tokens per request.
- Test retrieval in the middle of a long context.
- Confirm the provider's actual limit, which may differ from the model card.
Largest context windows
| # | Model | Provider | Input / 1M | Output / 1M | Context | Avg score |
|---|---|---|---|---|---|---|
| 1 | GPT-5.2 Pro | OpenAI | $21.32 | $76.33 | 2,000,000 | 89.6 |
| 2 | Claude Opus 4.5 Reasoning | Anthropic | $20.91 | $108.13 | 2,000,000 | 88.2 |
| 3 | GPT-5.2 | OpenAI | $19.71 | $85.71 | 2,000,000 | 88.0 |
| 4 | GPT-5.1 Max | OpenAI | $20.50 | $103.98 | 2,000,000 | 87.9 |
| 5 | Gemini 3 Pro Max | Google DeepMind | $20.57 | $112.92 | 2,000,000 | 87.9 |
| 6 | Grok 4 Reasoning | xAI | $19.67 | $93.29 | 2,000,000 | 87.8 |
| 7 | Grok 4 Max | xAI | $19.70 | $98.29 | 2,000,000 | 86.6 |
| 8 | o4 Turbo | OpenAI | $19.34 | $82.19 | 2,000,000 | 86.6 |
| 9 | o4 Max | OpenAI | $19.51 | $93.98 | 2,000,000 | 86.2 |
| 10 | Gemini 3 Pro | Google DeepMind | $18.24 | $82.93 | 2,000,000 | 86.1 |
| 11 | GPT-5.1 Turbo | OpenAI | $19.19 | $89.83 | 2,000,000 | 86.1 |
| 12 | GPT-5.1 | OpenAI | $19.01 | $69.84 | 2,000,000 | 86.0 |
| 13 | Grok 3 Max | xAI | $17.66 | $89.12 | 2,000,000 | 85.9 |
| 14 | Qwen3-Max Reasoning | Alibaba Cloud | $18.12 | $81.94 | 2,000,000 | 85.9 |
| 15 | Claude Opus 4.5 Turbo | Anthropic | $19.57 | $106.60 | 2,000,000 | 85.7 |
| 16 | o4 | OpenAI | $17.74 | $66.00 | 2,000,000 | 85.4 |
| 17 | o3 Max | OpenAI | $17.82 | $90.55 | 2,000,000 | 84.8 |
| 18 | GPT-5.2 Max | OpenAI | $21.39 | $90.69 | 1,000,000 | 89.2 |
| 19 | Claude Opus 4.5 Max | Anthropic | $20.90 | $106.51 | 1,000,000 | 87.8 |
| 20 | GPT-5.2 Reasoning | OpenAI | $20.98 | $102.78 | 1,000,000 | 87.5 |
Methodology
This story uses the AI & LLM Index dataset: 600 models, 40 providers and 12 benchmarks. Prices are listed per million tokens. Scores are modelled estimates on a 0–100 scale and are not official benchmark results. Figures are rounded for readability.
Related
FAQ
What does the Largest context windows in 2026 data show?
The largest context windows in the index. The top 20 models are ranked by token capacity, then by average benchmark score.
Are the numbers official?
No. Prices and scores are compiled for this demo index. Benchmark values are modelled estimates, not official results. Verify figures with the provider or benchmark owner before making decisions.
How should I use this ranking?
Use it to form a shortlist. Check the specific model pages, compare price and context, and test the shortlist on your own examples before committing.